Poly(dG-Me5dC) is known to exhibit a B----Z transition in the presence of very high concentrations of NaCl. For the first time, we report the presence of a Z-structure in sodium concentrations as low as 0.5 mM. A novel Z in equilibrium B in equilibrium Z transition is observed as the salt concentration is gradually increased. The role of water structure in B to Z transitions is discussed.
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Latha et al. (1985) studied this question.
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